function getFilesize($num) { $p = 0; $format = 'bytes'; if( $num > 0 && $num < 1024 ) { $p = 0; return number_format($num) . ' ' . $format; } if( $num >= 1024 && $num < pow(1024, 2) ){ $p = 1; $format = 'KB'; } if ( $num >= pow(1024, 2) && $num < pow(1024, 3) ) { $p = 2; $format = 'MB'; } if ( $num >= pow(1024, 3) && $num < pow(1024, 4) ) { $p = 3; $format = 'GB'; } if ( $num >= pow(1024, 4) && $num < pow(1024, 5) ) { $p = 3; $format = 'TB'; } $num /= pow(1024, $p); return number_format($num, 3) . ' ' . $format; }